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1. Community
2. [EN] Smart Thermostat
3. Netatmo Thermostat shows heating active but boiler does not fire after long standby

I am using the standard Smart Thermostat in dry-contact (On/Off) mode. It is not a modulating (OpenTherm) setup. The relay is connected via COM and NO to the boiler’s RT terminals.

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• 26. Februar 2026 23:00
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1. Community
2. [EN] Smart Thermostat
3. Netatmo Thermostat shows heating active but boiler does not fire after long standby

Thank you for your suggestion. One thing I am trying to understand is this: If the relay has a hardware defect, why does the system start working normally again after I completely power cycle the...

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• 26. Februar 2026 22:18
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1. Community
2. [EN] Smart Thermostat
3. Netatmo Thermostat shows heating active but boiler does not fire after long standby

Thank you for your reply. Yes, the relay is powered from inside the boiler, so when I power cycle the boiler, the relay also restarts. I have not tested power cycling only the relay separately, b...

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• 26. Februar 2026 21:19
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